After 3 attempts at applying a protector I realised two important factors (no instructions were included, but I am familiar with the process).
The following is why I believe others have had a problem...
Firstly, the side of the protector marked "front" is infact the back! Only one side is adhesive, and they are marked the wrong way round, the first 2 protectors were wasted because of this as they did not stick.
Secondly, be sure to check that the protectors are the correct way up (the "back" sticker to the bottom of the screen) as despite the HD screen being symmetrical, the protectors aren't and don't fit properly the other way around. Check before you remove the strips and you'll see the orientation is important.
Other than that they work great! If it weren't for the above I'd give 5*